Trycom TRP-C28
RS-485 Converter

  • Interface: RS485

4CH Isolated Digital Input & 4CH Relay

TRP-C28 provides 4 optical isolated digital input channels and 4 power relays output. All channels features screw terminals for convenient connection of field signals as well as LED’s to indicate channel status. Input channels are equipped with 3750 Vms DC isolation, and surge protection on RS-485 data lines that protect the module and device against high power voltage input and ground potential differences. For easy user access, TRP-C28 can enter configuration mode and self-test mode with outer dip-switch. TRP-C28 support both ASCII and Modbus protocol, with a full set of command, dual watch-dog, and auto reset function the module can be bi-directionally remote controlled by PC in ASCII or Modbus RTU protocol.

What's included

  • Main unit (Power supply not included)
  • Software CD

Trycom TRP-C28
RS-485 Converter

  • Interface: RS485

art : TRP-C28
€ 138 excl. VAT
€ 173 incl. VAT

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More information


Input channel4
Input optical isolation3750 Vrms
Input logical level 0+1V (max)
Input logical level 1+4.0V to +30V
Communication interfaceRS-485
Communication speed0.2kbps to 115.2Kbps
Input impedance3Kohm
Distance500m (MAX)
Digital Input can be used as counter channelYes, 4
Counter frequency100Hz
Output channel4 channel power reply outputs
Relay type2 Form A (RL1,RL2), 2 Form C (RL3,RL4)
Contact ratting5A/30V DC, 5A/120V AC, 5A/250V AC
Relay surge strength4000V
Relay operating time3ms
Relay operating life20 000 000
Dual watchdogHardware reset circuit, module and host operating status
Signal LEDPower on, all channels
Power supplyScrew terminal, or external DC adapter
Connection typeScrew terminal
Power consumption2.7W
Operating environment-10 to 50°C
Storage temperature-20 to 70°C
Humidity10-90% Non-condensing
Dimension (mm)151 x 75 x 26

Product information

  • Wide input range DC power supply
  • Support ASCII and Modbus RTU protocol
  • Supports baud rates from 1.2Kbps to 115.2 Kbps
  • All 4 channels digital input ca be used as counter
  • Digital input signal with 3750Vrms isolation protection
  • Dual watchdog: Module’s firmware, host computer traffic
  • LED for each channels working status
  • DIN rail and panel mount support
  • Configured and self-test by outer dip-switch
  • Support screw terminal and external DC power adapter

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